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Magneto-optical current transformer technology

How to study this subject

The MOCT measures the electric current by means of Faraday Effect, which
was first observed by Michael Faraday 150 years ago. The Faraday Effect
is the phenomenon that the orientation of polarized light rotates under
the influence of the magnetic fields and the rotation angle is
proportional to the strength of the magnetic field component in the
direction of optical path.

The MOCT measures the rotation angle
caused by the magnetic field and converts it into a signal of few volts
proportional to the electric currant. It consist of a sensor head
located near the current carrying conductor, an electronic signal
processing unit and fiber optical cables linking to these two parts. The
sensor head consist of only optical component such as fiber optical
cables, lenses, polarizers, glass prisms, mirrors etc. the signal is
brought down by fiber optical cables to the signal processing unit and
there is no need to use the metallic wires to transfer the signal.
Therefore the insulation structure of an MOCT is simpler than that of a
conventional current transformer, and there is no risk of fire or
explosion by the MOCT. In addition to the insulation benefits, a MOCT is
able to provide high immunity to electromagnetic interferences, wider
frequency response, large dynamic range and low outputs which are
compatible with the inputs of analog to digital converters. They are
ideal for the interference between power systems and computer systems.
And there is a growing interest in using MOCTs to measure the electric
currents.